multiple commands at command prompt

Question
Can you type more than one command at one command prompt?

Answer
Yes, use the pipe or the ampersand to separate your commands. The shell and version of Windows you are using decides what character to use. Below are some additional examples for each version of Windows and shell. In both of these examples the command would first get to the root of the current drive and then run the dir command to list the current contents of the root.

Microsoft Windows 95, Windows 98 and Windows ME users

cd\ | dir

Microsoft Windows 2000 and Windows XP users using the command shell

Instead of using the pipe Microsoft decided to change it to the ampersand (&) for reasons unknown by us. Therefore you would need to type the below command to have the same results as earlier versions of Windows.

cd\ & dir

Comments

Opatch apply/lsinventory error: oneoff is corrupted or does not exist

I am applying the quarterly patch for 19c RDBMS, I tried using napply but failed, but somehow it corrupted the inventory though nothing applied. further apply and lsinventory command ran into error like this: $ ./OPatch/opatch lsinventory Oracle Interim Patch Installer version 12.2.0.1.21 Copyright (c) 2020, Oracle Corporation. All rights reserved. Oracle Home : /u02/app/oracle/19.0.0 Central Inventory : /u01/app/oraInventory from : /u02/app/oracle/19.0.0/oraInst.loc OPatch version : 12.2.0.1.21 OUI version : 12.2.0.7.0 Log file location : /u02/app/oracle/19.0.0/cfgtoollogs/opatch/opatch2020-09-08_13-35-59PM_1.log Lsinventory Output file location : /u02/app/oracle/19.0.0/cfgtoollogs/opatch/lsinv/lsinventory2020-09-08_13-35-59PM.txt -------------------------------------------------------------------------------- Inventory load failed... OPatch cannot load inventory ...

oracle dba_hist_sysmetric_summary

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fix bad query plan using sql profile created by coe_xfr_sql_profile.sql

After database upgrade from 10g to 12c, some of queries have bad performance, elapsed time are changed from less than 1 second to a few minutes, the immediately fix is to force the application to use 10g optimizer by either change database parameter or use database logon trigger to force specific application to choose the 10g optimizer. I used the database trigger. CREATE OR REPLACE TRIGGER sys.triggername AFTER LOGON ON DATABASE WHEN (upper(sys_context('USERENV','MODULE')) like '%APP_UPPERCASE%' or upper(sys_context('USERENV','MODULE')) like '% APP_UPPERCASE %') BEGIN /* some functions of application running slow after db upgrade from 10g to 12c, this trigger helps to force them to use 10g optimizer and get their normal performance*/ EXECUTE IMMEDIATE 'ALTER SESSION SET optimizer_features_enable=''10.2.0.5'''; END triggername ; / I engaged oracle support on troubleshooting this, sent MOS...

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